Computex — Mechanical keyboards are all the rage these days, and Rosewill's RK-9000 series seems to be pretty popular. While at the Computex trade show in Taipei, Taiwan, we saw several new versions on display. The most intriguing is the RK-9100, which adds a couple of USB ports and LED backlighting to the mix. Although all the keys are backlit, users can choose to have only the WASD and directional triangles illuminated. The backlight brightness is adjustable, and the lighting can be turned off completely.